Disk-sharpener.



W. 0. VEVLE. DISK SHARPENEB. APPLIOATION FILED JUNE 12, 1909.

964,071. I r Patented July 12,1910.

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Patented July 12, 1910.

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AQPPLIOATION FILED JUNE 12, 1909 964,071 Patented July 12, 1910,

a sums-sum Ill awe/whoa Wilizezfl? 0. Vvla WILI-IELM O. VEVLE, OF ADA, MINNESOTA.

DISK-SHARPENER.

Specification of Letters Patent.

Patented July 12, 1910.

Application filed June 12, 1909. Serial N 0. 501,827.

To all whom it may concern:

Be it known that I, VVILHELM O. VEVLE, a citizen of the United States, residing at Ada, in the county of Norman and State of Minnesota, have invented certain new and useful Improvements in Disk-Sharpeners, of which the following is a specification.

My invention relates to an improvement in disk sharpeners, and the object is to pro-v vide means for bringing into contact with the surfaces of the rotating disks emery wheels for grinding the surfaces of the disks. The emery wheels are adapted to be shifted from one face of the disks to the other during the sharpening operation, whereby both sllirfaces of the disks may be properly beve e A further object is in providing means for eccentrically operating the emery wheels for moving them inward toward the center of the disk for producing a longer bevel thereby forming a smooth cutting surface to the disk and preventing dirt from adhering to the surfaces of the disks.

The invention consists of certain novel features of construction and combinations of parts which will be hereinafter described and pointed out in the claims.

In the accompanying drawings-Figure l is a view in side elevation; Fig. 2 is a top plan Fig. 3 is a detail view of one of the arms carrying the emery wheels; Fig. 4 is a detail view of the bottom and its connecting rod; Fig. 5 is a cross-sectional view of the machine.

A, represents the frame, upon which is mounted a shaft for carrying the drive pulley 2 and a chuck 3. One end of the axle of the disks B is held in the chuck, and the other end of the axle is mounted on a bearing 1. The pulley 2 is adapted to be rotated from any suitable source of power for rotating the disks B.

Mounted upon the frame is a bar 6, to which is pivotally connected the bar 7 b strips 8. Pivotally held between the bar and strips 8 are arms 9, which are provided with forked ends 10, in which are held pieces of emery or emery wheels 11. The lower ends of the arms 9 are provided with curved slots 12 through which bolts 13 pass for guiding the movement of the arms. Springs 14: are connected to the lower ends of the arms 9 and the opposite end of the spring is connected to the strips 8. The springs are under a certain amount of tension and tend to holdthe emery wheels against the disks during the grinding operation. A rack segment 15 is mounted on the frame and the lever 16 is pivotally mounted on the frame which is provided with a bolt 17 adapted to enter the rack teeth of the segment 15. The sleeve 18, loosely mounted on the bar 6 and held thereon by the nuts 19, is connected to the lever 16. Upon the operation of the lever the bar 6 can be reciprocated, causing the emery wheels to be drawn into contact with the disks and to bear against the disks with difierent pressures. Also upon the reciprocation of the bar the emery wheels can be shifted to the opposite surfaces or faces of the disks for grinding. A lever 20 is con nected to the bars 6 and 7 for swinging the emery wheels into position whereby they may be drawn into engagement with the disks by the lever 16. A sprocket wheel 21 is mounted on the shaft 1, and a crank shaft 22 mounted on the frame is provided with a sprocket wheel 23, which is driven by a sprocket chain 2 1 which passes over sprocket wheel 21. Pitmen 25 are connected to the crank shaft and connected to the pitmen are rods 26, the rods and pitmen being adjustably connected for regulating the eccentric movement transmitted from the shaft 22. The rods 26 are connected to the bar 6 so that as the shaft 22 is rotated the eccentric or oscillating movement is transmitted to the emery wheels for producing a longer bevel toward the center of the disk from the outer edge thereof. The desired bevel is regulated by the adjustment of the rods 26 and pitmen 25.

A curved spring bar 27 is mounted on an upright 28 on the frame, and the lever 20 is held by this bar whereby the difierent tensions or pressures of the grinding wheels upon the disk are regulated. This is accomplished and is governed by the lever 16. The lever 16 will reciprocate the bar 6 to bring the grinding wheels into contact with the disks and the position taken by the lever in its engagement with the rack segment will govern the tension placed upon the disks by the grinding. The bar 7 being pivotally connected to the bar 6 and the lever 20 being pivotally connected to both bars, the bar 7 is capable of lateral movement, which is necessary so that the grinding wheels in their movements can travel over the beveled surfaces of the disks. Supposing the lever 16 has moved the bar 6 whereby the grinding wheels are brought into contact with the disks near their centers, the eccentrlc motion will cause the emery wheels to travel toward the circumference of the disks, and this same motion will move the lever 20 to the left following the curvature of the bar 27, thereby keeping a constant pressure which is uniform throughout the entire eccentric movement. Of course during the movement when the emery wheels are moving from the circumference of the disks and toward the centers of the disks the lever 20 will move backward or toward the right along the spring bar 27, but there will always be a uniform pressure of the grinding wheels against the disks. The pressure of the emery wheels against the disks is obtained by the combined action of the springs 14 and the lever 20, which operates against the spring bar 27. The action of the springs assists greatly in sharpening a wabbly disk, and in the majority of instances few old disks are true. The springs 14 keep the grinding wheel close to the surface of the disks at all times accomplishing what the pressure from the lever alone could not do. Due to the fact that the bar 7 is pivotally connected to the stationary bar 6, that is the bar 6 can only be moved upon the operation of the lever 16 and remain stationary during the entire grinding operation unless moved by the lever 16, the bar is capable of lateral movement and will permit the grinding Wheels to respond to the action of the springs 14 and the lever 20 for Obtaining the desired tension and pressure of the grinding wheels upon the disks.

From the foregoing it will be seen that I have provided a lever whereby the entire disk section of a cultivator, disk harrow, or other machine can be ground and the desired bevel formed on the disks at one operation. The lever can be adapted to grind any number of disks by simply applying the arms 9 to the bar 7. The emery wheels are capable of being reciprocated for placing them on either side of the disks and the eccentric or oscillating movement which is transmitted to the emery wheels will produce the desired bevel to the surface of the disks.

It is evident that more or less slight changes might be made in the form and arrangement of the several parts described without departing from the spirit and scope of my invention, and hence I do not Wish to be limited to the exact construction herein set forth, but:

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a disk sharpener, the combination with a frame, of a shaft supported on the frame carrying a plurality of disks, means for rotating the disks, emery wheels mounted on the frame, and means for transmitting an oscillating movement to the emery wheels during the operation of the machine.

2. In a disk sharpener, the combination with a frame, of a shaft carrying a plurality of disks supported upon the frame, means for rotating the disks, emery wheels adapted to engage the disks, means for reciprocating the emery wheels, and means for transmitting an oscillating movementto the emery wheels during the operation of the machine.

3. In a disksharpener, the combination with a frame, of a shaft carrying disks thereon supported on the frame, means for rotating the shaft, a bar mounted on the frame, grinding wheels mounted thereon, means for operating the bar for reciprocating the grinding wheels, and means connected to the bar for moving the wheels out of engagement with the disks.

4. In a disk sharpener, the combination with a frame, of a shaft carrying disks supported on the frame, means for rotating the shaft, grinding wheels adapted to engage the disks, a crank shaft, means for transmitting motion to the crank shaft, means connecting the crank shaft and grinding wheels for transmitting an oscillating motion to the grinding wheels, and means for moving the wheels out of the path of the disks.

5. In a disk sharpener, the combination with a frame, of a shaft carrying disks supported upon the frame, means for rotating the shaft, a bar mounted on the frame, grinding wheels pivotally mounted thereon, a lever connected to the bar for reciprocating the grinding wheels, and means for moving the grinding wheels whereby they may be shifted to another position.

6. I11 a disk sharpener, the combination with a frame, of a shaft carrying disks mounted thereon, means for rotating the shaft, a bar mounted upon the frame, a lever reciprocating the bar, spring controlled grinding wheels pivotally supported on the bar, a crank shaft, means for transmitting motion to the shaft, means connecting the crank shaft and bar for transmitting an oscillating motion to the grinding Wheels on the rotation of the crank shaft.

7. In a disk sharpener, the combination with a frame, of a shaft carrying disks thereon supported on the frame, means for rotating the disks, a bar, grinding wheels mounted on the bar, means for transmitting an eccentric movement to the grinding wheels, and means connected to the bar whereby a uniform pressure is obtained by the grinding Wheels against the disks.

8. In a disk sharpener, the combination with a frame, of a shaft carrying disks thereon supported on the frame, means for rotating the disks a bar, grinding Wheels mounted on the bar, means for transmitting motion to the grinding Wheels, a lever conneeted to the bar, and means engaging the lever whereby the grinding Wheels Will eX- ert a uniform pressure against the disks during the movement of the grinding Wheels.

In testimony whereof I affiX my signature, in the presence of two Witnesses.

WILHELM O. VEVLE.

Witnesses:

M. A. BRATTLAND, W. F. ANDREWS. 

